/Engine/Source/Runtime/Engine/Classes/Engine/StreamableManager.h
GetOutermostHandle
[TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FStreamableHandle](API\Runtime\Engine\Engine\FStreamableHandle) > FindMatchingHandle ( [TFunction](API\Runtime\Core\GenericPlatform\TFunction)< bool(const [FStreamableHandle](API\Runtime\Engine\Engine\FStreamableHandle) &)> Predicate ) const